Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
van hanh » van thanh, ban hanh, van anh
hanh lua » hanh luat, hanh sua, hanh cua
lua dung » qua dung, luan hung, qua duong
cong tan » cong tac, cong san, cong thanh
tan phi » tac phi, tan phu, toan phai
phi phi » chi phi, phi thi, thi phi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (chieu tinh)) - van hanh lua dung cong tan phi phi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (chieu tinh)) - van hanh lua dung cong tan phi phi.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (chieu tinh)) - van hanh lua dung cong tan phi phi*.